How to Use charger module circuit : Examples, Pinouts, and Specs

The ETA9650 is a highly efficient charger module circuit designed to convert AC or DC power into a suitable voltage and current for charging batteries or powering devices. Manufactured by ETA, this module integrates advanced features to ensure safe, reliable, and efficient charging. It is commonly used in portable electronics, power banks, IoT devices, and other battery-powered applications.

• Charging lithium-ion or lithium-polymer batteries
• Powering portable electronic devices
• Integration into power banks and battery management systems
• IoT devices requiring compact and efficient charging solutions

The ETA9650 charger module circuit is designed with robust technical capabilities to meet the demands of modern electronic devices. Below are the key specifications:

The ETA9650 module features a 10-pin DFN package. Below is the pinout and description:

The ETA9650 charger module circuit is straightforward to use in a variety of applications. Below are the steps and considerations for integrating it into your design:

1. Power Supply: Connect a DC power source (4.5V to 28V) to the VIN pin. Ensure the input voltage is within the specified range.
2. Battery Connection: Connect the positive terminal of the battery to the BAT pin and the negative terminal to GND.
3. Set Charging Current: Use a resistor on the ISET pin to configure the desired charging current. Refer to the datasheet for the resistor value corresponding to your required current.
4. Enable Charging: Pull the EN pin high to enable charging. If left floating, the module will remain disabled.
5. Monitor Status: Use the CHG_OK and STAT pins to monitor the charging status. These pins can be connected to LEDs or a microcontroller for visual or digital feedback.
6. Temperature Monitoring: Connect an NTC thermistor to the NTC pin for battery temperature monitoring. This ensures safe charging by halting the process if the battery temperature exceeds safe limits.

• Thermal Management: Ensure proper heat dissipation, especially when charging at high currents. Use a heatsink or place the module on a PCB with good thermal conductivity.
• Battery Compatibility: Verify that the battery chemistry and voltage are compatible with the ETA9650's output.
• Safety Features: Utilize the NTC pin for temperature monitoring to prevent overheating and potential damage to the battery.
• Input Voltage: Avoid exceeding the maximum input voltage of 28V to prevent damage to the module.

The ETA9650 can be connected to an Arduino UNO to monitor charging status. Below is an example code snippet:

// Example code to monitor ETA9650 charging status with Arduino UNO

#define CHG_OK_PIN 2  // Connect CHG_OK pin of ETA9650 to Arduino digital pin 2
#define STAT_PIN 3    // Connect STAT pin of ETA9650 to Arduino digital pin 3

void setup() {
  pinMode(CHG_OK_PIN, INPUT);  // Set CHG_OK pin as input
  pinMode(STAT_PIN, INPUT);    // Set STAT pin as input
  Serial.begin(9600);          // Initialize serial communication
}

void loop() {
  int chgStatus = digitalRead(CHG_OK_PIN);  // Read CHG_OK pin status
  int statStatus = digitalRead(STAT_PIN);  // Read STAT pin status

  // Print charging status to the serial monitor
  if (chgStatus == LOW) {
    Serial.println("Charging in progress...");
  } else {
    Serial.println("Charging complete or no battery connected.");
  }

  // Print additional status information
  if (statStatus == HIGH) {
    Serial.println("Battery is fully charged.");
  } else {
    Serial.println("Battery is still charging.");
  }

  delay(1000);  // Wait for 1 second before checking again
}

1. Module Overheating

   • Cause: High charging current or insufficient heat dissipation.
   • Solution: Reduce the charging current by adjusting the resistor on the ISET pin. Ensure proper thermal management by using a heatsink or a well-designed PCB.

2. Battery Not Charging

   • Cause: Incorrect wiring or incompatible battery.
   • Solution: Verify all connections and ensure the battery voltage and chemistry are compatible with the ETA9650.

3. CHG_OK Pin Always High

   • Cause: No battery connected or battery already fully charged.
   • Solution: Check the battery connection and ensure the battery is not already at full capacity.

4. Input Voltage Out of Range

   • Cause: Input voltage below 4.5V or above 28V.
   • Solution: Use a power source within the specified input voltage range.

Q: Can the ETA9650 charge multiple batteries in series?
A: No, the ETA9650 is designed for single-cell lithium-ion or lithium-polymer batteries. For multiple cells, use a battery management system (BMS) designed for series configurations.

Q: Is the ETA9650 suitable for fast charging?
A: Yes, the ETA9650 supports charging currents up to 2A, making it suitable for fast charging applications.

Q: How do I calculate the resistor value for the ISET pin?
A: Refer to the ETA9650 datasheet for the formula or table that correlates resistor values to charging current.

Q: Can I use the ETA9650 without the NTC pin?
A: While the NTC pin is optional, it is highly recommended to use it for battery temperature monitoring to ensure safe operation.

This concludes the documentation for the ETA9650 charger module circuit. For further details, refer to the official datasheet or contact ETA support.